Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cd269e4f35dbf4a…

MALICIOUS

PDF

73.9 KB Created: 2021-09-04 20:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e60b1e829ddae6d5661c23d129ed1765 SHA-1: 3984e46de9335fa960385a8c3c8d7a415c6fe83a SHA-256: 7cd269e4f35dbf4a0d1772c768bc5f3ebeae1b83b1d0a6def2593d9b018bf876
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on disposable domains or compromised CMS uploads, indicative of a link farm used for phishing or malware distribution. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly supports its malicious nature. The presence of embedded URLs and the overall structure suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://queure.ru/uplcv?utm_term=collaboration+reflection+worksheet PDF link annotation
    • http://antonio-pelella.eu/userfiles/files/83679161654.pdfIn PDF document text
    • http://gistys.com/userfiles/file/15462815538.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/39703947323.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/dumowokizuriw.pdfIn PDF document text
    • http://sualaptoplayngay.com/ImagesVA/file/zoxatu.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/41020694200.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/db9d343c75a64104a02bc1baf641487e/todarokunujoberogedamivi.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/7ce071edb96381505d6d653ca6ba4d28/nekafiwosuguzefebelewe.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/rodibelorelele.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/21761810038.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/25172179549.pdfIn PDF document text
    • http://technocom.pl/editor/file/nerutadiru.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/zejima.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/jigazidakazapo.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4e153bdbcfb932ef2394ab27db378cc1/gevabakexolituzaxut.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16109fbdfe2504---gikilobireduweko.pdfIn PDF document text
    • https://keongracun.org/contents//files/42756977888.pdfIn PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/74280298825.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/53904030107.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/93853108615.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/rikomo.pdfIn PDF document text
    • https://estoniapools.com/contents/files/vuxofonimeri.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/30156725582.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD36 16788 bytes
SHA-256: 6e7af325af655700f5a55d2591605da63d5c0467b72e158610daca3e73e0fa9a
font_01_sfnt_off0000e87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87C 10784 bytes
SHA-256: 6f9f74620252e367c79b5a3ba1ec2d359b389c51014f8eca1b99d2a265755dbd
font_02_sfnt_off00010164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10164 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1